Piston construction



Aprifi 26, 1932, LA BRIE 1,855,554 I PISTON CONSTRUCTION Filed Aug. 17, 1931 2 Sheets-Sheet 1 I nvenlor Apnfifi 26, @932. LA BRIE 1,855,554

'PISTON CONSTRUCTION 7 Filed Aug. 1'7, 1951 2 Sheets-Sheet 2 iw ii L/LJ Inventor By omey Patented Apr. 26, 1932 PATENT OFFICE ANTOINE LA BRIE, OF DETROIT, MICHIGAN PISTON CONSTRUCTIO1\T Application filed August 17, 1931. Serial No. 557,614.

This invention relates to certain appreciable refinements and improvements embodied in what is believed to be a novel contribution to the art of constructing pistons, pins, and packing rings.

The invention has more explicit reference to the particular construction of the head of a piston, and in the present instance, the novelty is predicated .on the specific formation'of 1 the head per se and associated appurtenances such as the connecting rod pins, and a special packing and retention ring associated with said head and pins.

My primary aim is to generally improve upon structures of this classification by providing a novel association of pin, head and packing ring, wherein the packing ring is appreciably wider than ordinary rings, and wherein it is given the additional function of aiding in maintaining the piston pin in operative position.

I have achieved the desired result by selecting and mechanically co-ordinating the aforesaidparts in a structurally distinctive manner with the thought in mind of promoting efliciency in assembly for manufacturing and use, and maintaining such additional desirable features as simplicity and economy.

In the drawings:

Figure 1 represents an elevational View of the improved structure as developed in accordance with the present invention.

Figure 2 is a central vertical sectional view therethrough.

Figure 3 is a horizontal section.

Figure t is a fragmentary detail section.

Figure 5 is a fragmentary elevational View.

Referring now to the drawings by distinguishing reference characters, it will be observed that the numeral 6 designates the improved piston head which is in the form of a hollow casting of conventional configuration. In accordance with the invention the casting is formed with upper and lower excasting I provide the usual diametrically opposite inwardly projecting bearings 9 for the piston pin 10. The pin is here shown as of tubularfform and is considerably shorter than the diameter of the piston head itself. In fact, the ends of the piston pin terminate in inwardly spaced relation from the bottom of the relatively Wide centrally disposed special ring groove 11. This groove 11, it will be noted, is considerably wider than the ordinary ring groove, and it is adapted to accommodate a wide band-like special packing ring 12 of splitend form. The base 13 of the groove 11 limits the inward contraction of the ring 12. Interposed between the inner periphery of the ring 12 and the adjacent end of the piston pin 10 are duplicate tapered spiral springs 14.

The springs bear against the pin to maintain the pin in place and bear against the ring 12 to aid in expanding said ring. It is evident therefore, that the feature of construction is in the centralized special wide packing ring 12, the interposed spring 14 and the relatively short hollow piston pin 10. This provides an unusually novel assembly whereby the spring serves to aidin expanding the ring and wherein the ring holds the spring in place as well as prevents displace ment of the pin 10 and forms a closure for the groovell.

Under this arrangement the piston pin is virtually locked in place by the piston ring. Particularly do I wish to emphasize the centralized placement of the special wide band ring-in the correspondingly widened groove of the piston. The ring in this position serves to promote satisfactory and dependable compression and constitutes a retention element for the piston pin and its spring.

Being assembled this way, the piston pin cannot break easily because the special ring protects it and insures a strong and sturdy assembly. Should the piston pin break for any reason, the cylinder wall (not shown) will not be damaged because the ring will serve as a closure and prevent the fragments of the broken piston pin from prO ecting and scoring the wall of the piston. The use of a wide ring provides for far more satisfactory compression than ordinary narrow V rings and produces the desired oil seal.

Then too, the expansion coil springs serve in centering the relatively short piston pin.

As a matter of fact, persons skilled in the art to which the invention relates will be able to appreciate these and other features and advantages of this novel arrangement.

It is thought that the description taken in connection with the drawings will enable a clear understanding of the invention to be had. Therefore, a'more lengthy description is thought unnecessary.

While the preferred embodiment of the invention has been shown and described, it is to be understood that minor changes coming within the field of invention claimed may be resorted to if desired- I claimi A piston construction comprising a hollow piston head formed with a pair of diametrically opposite inwardly protruding piston pin bearings, and a radially alined circumferential relatively wide centralized piston ring groove, a piston pin fitting in said bearings, said pin being of a length considerably less than the diameter of the piston head, a piston ring fitting in said groove, and coiled springs interposed between said pin and the inner periphery of said ring, with the inner ends of said springs resting on the adjacent ends of said pin.

In testimony whereof I afiix my signature.

ANTOINE LA BRIE. 

